Coach A plays to the strength of his opposition. That's my big takeaway from this data. That could also mean a mix of teams that includes both optimal and suboptimal ones. Knowing who coach A is, just confirms this.

Coach B wins 60% in the Box. He's doing something right. Not playing tournaments doesn't mean much, there are many reasons for this.

_________________What is Nuffle's tree? Risk its trunk, space the branches. Touchdowns are its fruit.
What is Nuffle's lawn? Inches, squares, and Tackle Zones; reddened blades of grass.

Issue is that winning isn't the sole measurement of success in a game like Blood Bowl. I see a lot of coaches that can win more than 50% of their matches, but some don't seem to enjoy the match or even the game sometimes.